Mars’s Air Up There
Sky & Telescope

Since their arrival on the red planet, the Mars Exploration Rovers have sent back thousands of breathtaking pictures of the ruddy landscape. The rovers are doing much more than analyzing rocks and looking for water. Michael Wolff (Planetary Science Institute), Michael Smith (NASA/Goddard Space Flight Center), and others have been using Spirit and Opportunity to learn as much as they can about Mars’s atmosphere and weather.